Types ofvariables numerical continuous Infinitenumber ofpossible values thatcan be measured age discrete Finitevalue thatcan be counted numbero fpeople categorical nominal gender oroinal ordered categories ranges population and sample POPUlation OFInterest sPeCiFiC grOUP OFIndiviOvals From whom you are trying to draw conclusions sample manageable representation ofpopulation Ifrepresentative results are generalizable Type OFSNOY observational no intervention no casual relationship experimenal interventationto study effects casualrelationship Observation Factor Figure collected from a variable sample statistic value calculated based on the Observed sample population parameter number that decribes something aboutentire population measures For center ofa dataset mean 5 indicators sensitive tooutliers skewed tothe left meansmedian xits z xn xn median Med srewed tothe right mean median nearlysymmetric mean approx median value in the middle ofa data set 11 more resistanttooutliers mode M08 mostFrequently occuring number rightskewed leF srewed spread For SAMPLE OFPopulation whole population standard deviation 0 SC on average now far each value lies from the mean variance OSC s difference between each data pointand the mean ScatterPlOt distribution of one variable association between two variables For numerical continues class intervals DO Pl0t darker color more observations a X kk 83 8 Q3 Range max min Data summaries Histogram view data density bOXPIO distribution ofone variable Q3 1 5x1QR 3 med QI Q1 1 5X1QR outliers claims Will hypothesis no statistical relationship all is due tochance alternatehypothesis rejects null hypothesis whatyou are testing For
View Full Document
Unlocking...